Vapor pressure gauge



March 17, 1936. ME. CHENEYETVALY VAPOR PRESSURE GAUGE Filed Jan. 1, 1929 4 IIIIIIFIIL gvwmtou Patented Mar. 17, 1936 r UNITED STATES PATENT OFFICE l VAPOR. PRESSURF, GAUGE- Moses E. Cheney and Adrian P. Brietzke La Crosse, Wis., assignors, by mesne assignments, to Moto Meter .Gauge & Equipment Corporation, a. corporation of Delaware (1935) Application January 1, 1929, Serial 190.329. 681 Claims. (01. 73-109) This improvement relates to vapor pressure pointer the requisite movement to enable a degauges and is particularly concerned with imsirable form o'fjscale to be lused'. 3 To these ends proved intermediate connecting devices that are thepoint of connection between the pressure positioned between the pressure tube andthe tube and the intermediate "connectingdevice is- 5 pointer of the gauge. The invention is particuarranged to have preferably an arc oi 'movemlent 5 larly adapted to gauges of the Bourdon type. of substantially 80. A main object of the invention is to devise Other objectsfand advantages willbe in part such a train of mechanism as will give a deindicated in the following description and in part sirable progressive retarding eiiect to the pointer, rendered apparent therefrom in connection with,

whereby a more symmetrical scale can be used. the annexed drawing. i v

In this manner the objectionable form of non- To enable others skilled in the art so fully to uniform graduations marked on the scale can apprehend the underlying feature's hereof that be overcome to a great extent, it being .underthey may embody the same in the various, ways stood that in vapor pressure gauges the increment contemplated by this invention, a drawing de-.

of 'pressure-between'O and 10 'C. is often'very picting a preferred typical construction has 5 much less than between 90 and 100 C. been'ann'exed asa part of this disclosure and, in

In a general way, the improvement can be said such drawing like characters of reference dcto reside in giving to the pointer a two fold renote corresponding parts throughout all the ducing or retarding effect, as thepointer ad- .views, of which:-,- i r I vances from a position indicating the minimum In the drawing-Figure 1 is a plan .view of the 20 degree of temperature and subject to the minioperating mechanism; Fig. 2 is anend view and mum increment of pressure, to a position indi- Fig. 3 is a front view' of the dial and pointer. eating the maximum temperature and where it Referring to Fig. 1, the Bourdon tube is marked is subject to the maximum increment of presl and it is anchored securelyat one end'toa 5 sure. This result is obtained through the va-' part of the. casing (not shown) of the instruriable leverage between a driving means and a ment. The free end has pivotally mounted driven member having a slotand pin connection, thereon a link 2 which connects with an arm "3 together with a crank arm and connecting link of a bell cranklever or driving means 4' pivworking through a large angle from substantially otally mounted as at 4%. A second arm of the dead center, these parts being so arranged in lever 4 carries at its outer enda pin 5 which 30 their relation to each other between the free end engages a slot 6 iormed in an arm. 1 of a driven of the'Bourdon tube and the pointer that at zero member secured to the rotatable shaft 8. Intemperature or minimum pressure position, the tegral with this shaft 8 isa sector shapedgear pin on the driving means will be in a position member-i0 which meshes with a pinion H seto move substantially at right angles to the slot cured to the pointer shaft l2. The pointer I3 35 of the driven'member and the relative lengths 'of is likewise secured to this shaft I2 so that the the arms will be such as to produce a hi h mesector shaped member Ill transmits its movechanical advantage between thedriving means ment to said pointer I3, I and the driven member, while the crank arm Asappears clearly from Figs. 1 and 2, the pull 40 wi be ea d d Center, thereby i g he ost of theBourdon tube is in the line indicated by 40 eiiective pointer movement, whereas at the maxithe arrow a so that the crank arm 3 h s an miun temperature position, the'pin will be in a increased angular motion in the position shown position to move on a radial line with the slot in full lines (b)' from that in the other extreme while the mechanical advantage is reduced by a of its movement (c), indicated by dotted lines.

change in the relative length of the members, Likewise, in the position indicated in full lines 45 the movement being still further reduced by the (Fig. 1) the pin 5 will produce the maximum crank arm operating near the center of its throw. movement of the member ID because the move- In this way the increased increment of pressure 'ment of the pin will be substantially at right at the high point of the scale will transmit subangles to slot 6. Consequently at this point there stantially the same movement to the pointer as will be the maximum movement transmitted to 50 that produced by a decreased increment of presthe pointer while at the other extreme of movesure at the low point of the scale. Furthermore, ment of the crank arm 3 the pin 5 will move it is an object of the invention to arrange the substantially in line with said slot 6 producing parts so they can be assembled compactly within a minimum of movement of member I!) and at a case, having such a gear ratio as to give the this point there will be a further reduction due 55 In order to obtain the proper angular travel of the crank arm 3 and pin 5, and so calibrate the instrument, the respective arms of the member 4 may be manually moved nearer to or further away from the pivot 4 or moved clockwise or anti-clockwise, the amount and direction of movement being determined after the instrument has been tested. A still further adjustment may be made by giving to the link 2 a slight bend which would move both of the pivots of the link 2 closer together. No attempt has been made to show the different adjustment means that can be employed. However, as the adjustment mechanisms for calibrating the instrument form a part of all gauges of this Bourdon tube typedetalled description and illustration thereof is deemed unnecessary.

Without further analysis, the foregoing will so fully reveal the gist of this invention that others can, by applying current knowledge, readily adapt it for various utilizations by retaining one or more of the features that, from the standpoint of the prior art, fairly constitute essential characteristics of either the generic or specific aspects of this invention and, therefore such adaptations should be, and are intended to be, comprehended within the meaning and range of equivalency of the following claims. I

Having thus revealed this invention, we claim as new and desire to secure the following combinations and elements, orequivalents thereof, by Letters Patent of United States:

1. The combination in an indicator having a movable pointer of a'pivoted driven member having aslot therein, means connecting said driven member and said pointer, a driving member pivoted eccentrically to said driven member, a Bourdon tube, means operatively connecting said Bourdon tube and driving member and a pin on said driving member engaging in the slot in said driven member, said pin and slot connection being arranged so said pin moves continuously outwardly in said slot and away from the line through the centers of rotation of said driving and driven members to effect continuously decreasing relative angular movement of said driven member with respect to said driving member as said Bourdon tube moves under increasing pressure.

2. The combination in an indicator having a movable pointer of a pivoted driven member having a slot therein, means operatively connecting said driven member and pointer, a driving member pivoting about a center offset from the center of said driven member and having arms diverging from its pivot, a pin in one of said arms engaging. in theslot in said driven member, a Bourdon tube and means connecting said Bourdon tube and the other .arm of said driving member, said slot being arranged to be moved continuously on said driven member and said pointer, a bell crank driving member pivoting about a center offset from the center of said driven member and having a pin on one of its arms engaging in the slot in said driven member, a Bourdon tube and means connecting said Bourdon tube to the other arm of said driving member, said slot being arranged to be moved continuously on one side of the line through the centers of rotation of said driving and driven members as said Bourdon tube moves under increasing pressure and said pin and slot "connection being arranged to effect a continuously decreasing relative angular movement of said driven member with respect to said driving member.

4. In an indicator having a movable pointer and a Bourdon tube moving in response to variations in the vapor tension with changes in the temperature to be indicated, means connecting said ,Bourdon tube and pointer to move said pointer proportionately to the changes in temperature to be indicated comprising a pivotally mounted driven member having a slot extending radially of the driven member, means operatively connecting said driven member and pointer, a.

driving 'memberpivoting about a center ofiset from the center of rotation of said driven member, a pin on said driving member engaging in said slot and a link connecting said Bourdon tube and driving member, said link being arranged to operate said driving member through a gradually increasing effective lever arm and said pin and slot. connection being arranged to move continuously on one side of the line joining the centers of rotation of said driving and driven 'members and toprovide a gradually decreasing relative angular movement of said driven member with respect to said driving member as increasing temperature subjectssaid Bourdon tube to increasing vapor tension.

5. The combination in an indicator having a pointer movable between low andhigh'indicating limits of a pivoted driven member'having a radial vslot therein, means connecting said driven member and pointer, a driving member pivoted eccentrically to said driven member, the longitudinal axis of said slot extending in the same direction as the line passing through the centers of rotation of said drivingv and driven members when the pointer is in zero position, a pin on said driving member engaging in the slot in said driven member, a Bourdon tube and means operatively connecting said Bourdon tube and driving member, the pin and slot connection between the driving and driven member being such that there will be a decreasing rate of movement of the pointer upon increased expansion of the Bourdon tube.

MOSES E. CHENEY. ADRIAN P. BRIETZKE. 

